A Dominant 9 (A9) Chord Guitar

A dominant 9th anchored by the open A — with the full 3rd.

A dominant 9th (1-3-5-♭7-9) anchored by the open A.
Voiced with the full major 3rd for genuine dominant bite.
The funky, bluesy V chord in the key of D.
A staple of blues and R&B rhythm in A.

Root9th3rd5th7th

E6th

FretMuted

Finger—

A5th

FretOpen

FingerOpen

D4th

Fret2

Finger1

G3rd

Fret4

Finger4

B2nd

Fret2

Finger1

e1st

Fret3

Finger2

Notes: A – E – B – C# – G · Formula: 1 – 3 – 5 – ♭7 – 9

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Questions about A Dominant 9 (A9)

What notes are in a A Dominant 9 (A9) chord?

A A Dominant 9 (A9) chord contains the notes A, E, B, C#, G. It is built from the dominant 9th formula 1 - 3 - 5 - ♭7 - 9, with A as the root.

What notes are in an A9 chord?

A9 contains A, C♯, E, G and B — the root, major 3rd, perfect 5th, flat 7th and 9th. It's an A7 (A-C♯-E-G) with the 9th (B) added on top. That major 3rd and flat 7th are what make it a dominant chord, and the added 9th gives it its funky colour.

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